ES2540456B1

ES2540456B1 - Stop device for folding flaps on sheets of semi-rigid sheet material

Info

Publication number: ES2540456B1
Application number: ES201430014A
Authority: ES
Inventors: Telesforo González Olmos
Original assignee: Telesforo González Olmos
Current assignee: Telesforo Gonzalez Maquinaria SL
Priority date: 2014-01-08
Filing date: 2014-01-08
Publication date: 2016-04-20
Anticipated expiration: 2034-01-08
Also published as: ES2540456A1

Abstract

Dispositivo de tope para el doblado de solapas en planchas de material laminar semirrígido.#El dispositivo comprende un elemento de tope (1) que tiene una porción de anclaje (2) unida a una máquina formadora de cajas y un extremo de contacto (3) conectado a la porción de anclaje (2) por una porción elástica (4) que mantiene el extremo de contacto (3) en una posición de trabajo, en la que ofrece un punto de resistencia sobre o cerca de una línea de hendido (53) formada entre una solapa (51) y una aleta de pared (52) en una plancha de material laminar semirrígido (50). La porción elástica (4) ofrece una resistencia a la flexión que puede ser vencida por una fuerza ejercida por un dispositivo doblador (30) al girar la solapa (51) alrededor de dicha la línea de hendido (53) permitiendo el movimiento del extremo de contacto (3) desde la posición de trabajo hasta una posición retirada y su retorno a la posición de trabajo.Stop device for folding flaps on sheets of semi-rigid sheet material. # The device comprises a stop element (1) having an anchoring portion (2) attached to a box-forming machine and a contact end (3) connected to the anchoring portion (2) by an elastic portion (4) that keeps the contact end (3) in a working position, where it offers a point of resistance on or near a creasing line (53) formed between a flap (51) and a wall fin (52) on a sheet of semi-rigid sheet material (50). The elastic portion (4) offers a flexural strength that can be overcome by a force exerted by a bending device (30) by rotating the flap (51) around said creasing line (53) allowing movement of the end of contact (3) from the work position to a withdrawn position and return to the work position.

Description

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DESCRIPCIONDESCRIPTION

DISPOSITIVO DE TOPE PARA EL DOBLADO DE SOLAPAS EN PLANCHAS DE MATERIAL LAMINAR SEMIRRIGIDOBUMPER DEVICE FOR THE FOLDING OF SHEETS ON PLATES OF SEMI-DIRECTED LAMINAR MATERIAL

Campo de la tecnicaTechnique Field

La presente invencion concierne a un dispositivo de tope para el doblado de solapas a lo largo de llneas de hendido en planchas de material laminar semirrlgido. El dispositivo tiene aplicacion en el campo de las maquinas formadoras de cajas a partir de planchas planas de material semirrlgido previamente troqueladas. El dispositivo comprende un elemento de tope que ejerce un punto de resistencia sobre la llnea de hendido o en las inmediaciones de la misma para forzar que el giro de la solapa, el cual es realizado por un dispositivo doblador de la maquina formadora de cajas, se efectue a lo largo de esta llnea de hendido.The present invention concerns a stop device for the folding of flaps along creasing lines in sheets of semi-rigid sheet material. The device has application in the field of box-forming machines from flat sheets of previously rigid semi-rigid material. The device comprises a stop element that exerts a point of resistance on the creasing line or in the vicinity thereof to force that the rotation of the flap, which is performed by a folding device of the box-forming machine, be make along this line of creasing.

A lo largo de la presente descripcion, el termino "material laminar semirrlgido” se utiliza para designar cualquier material en lamina semirrlgido que pueda ser doblado para formar cajas, tal como por ejemplo lamina de carton, lamina de carton ondulado, lamina de plastico, lamina de plastico ondulado, y similares.Throughout the present description, the term "semi-rigid sheet material" is used to designate any semi-rigid sheet material that can be folded to form boxes, such as for example cardboard sheet, corrugated cardboard sheet, plastic sheet, sheet of corrugated plastic, and the like.

Antecedentes de la invencionBackground of the invention

A partir de los documentos US 2798416, US 3978774, ES 8700148 A1, ES 235835 U y ES 255122 U se conocen maquinas automaticas formadoras de cajas a partir de planchas planas de material laminar semirrlgido previamente troqueladas. Estas planchas planas de material laminar semirrlgido comprenden cortes y llneas de hendido que definen aletas y solapas que son convenientemente dobladas y pegadas por la maquina formadora de cajas para conformar las cajas. Para ello, las maquinas formadoras de cajas comprenden una cavidad de moldeo definida por varios conjuntos conformadores fijados a una bancada, un dispositivo de alimentacion de planchas planas que situa una a una las planchas planas en una posicion inicial sobre una embocadura de la cavidad de moldeo, y un macho que se desplaza accionado por un mecanismo de accionamiento presionando una porcion de fondo de la plancha plana al interior de la cavidad de moldeo, ocasionando con ello un plegado y pegado de dichas aletas y solapas de la plancha plana en cooperacion con diferentes elementos y dispositivos dispuestos en dichos conjuntos conformadores. A continuation, el macho es desplazado por el mecanismo de accionamiento en una direction opuesta a fuera de la cavidad de moldeo y la caja terminada es expulsada de la cavidad de moldeo. Este ciclo se repite.From US documents 2798416, US 3978774, ES 8700148 A1, ES 235835 U and ES 255122 U, automatic box-forming machines are known from flat sheets of pre-punched semi-rigid sheet material. These flat sheets of semi-rigid sheet material comprise cuts and creasing lines that define fins and flaps that are conveniently folded and glued by the box-forming machine to form the boxes. For this, the box-forming machines comprise a molding cavity defined by several forming assemblies fixed to a bed, a flat plate feeding device that places the flat plates one by one in an initial position on a mouth of the molding cavity , and a male that moves driven by a drive mechanism by pressing a bottom portion of the flat plate into the molding cavity, thereby causing folding and gluing of said flaps and flaps of the flat plate in cooperation with different elements and devices arranged in said forming assemblies. Then, the male is moved by the drive mechanism in a direction opposite to outside the molding cavity and the finished box is ejected from the molding cavity. This cycle repeats.

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Se conocen cajas de material laminar semirrlgido que tienen paredes laterales dobles, o de doble grosor, obtenidas por la superposicion y pegado de una solapa a una aleta que forma la pared lateral de la caja. Para ello, la solapa es doblada 180° alrededor de una llnea hendido paralela a otra llnea de hendido que conecta la aleta que forma la pared lateral a un panel de base de la caja.Semi-rigid laminar material boxes are known that have double side walls, or double thickness, obtained by overlapping and glueing a flap to a flap that forms the side wall of the box. To do this, the flap is folded 180 ° around a split line parallel to another split line that connects the flap that forms the side wall to a base panel of the box.

Existe una problematica relacionada con defectos de doblado de las solapas de pared doble en las planchas de material laminar semirrlgido, que se debe en parte a que el hendido del material laminar no cede ante la fuerza ejercida por el dispositivo doblador, lo que provoca que la solapa no gire sobre el eje formado por el hendido entre la solapa y la aleta para formar la pared doble, sino que el conjunto de solapa y aleta gire conjuntamente en torno a un eje determinado por la llnea de hendido entre la aleta y el panel de base de la caja.There is a problem related to bending defects of the double wall flaps in the sheets of semi-rigid sheet material, which is partly due to the fact that the lamination of the sheet material does not yield to the force exerted by the bending device, which causes the flap does not rotate on the axis formed by the cleft between the flap and the flap to form the double wall, but the flap and flap assembly rotate together around an axis determined by the crease line between the flap and the panel of box base.

El documento ES 1032786 U da a conocer un dispositivo de doblado de solapas de pared doble donde el doblado se realiza en dos pasos y fuera de la zona de la cavidad de moldeo. Este dispositivo comprende un dispositivo doblador accionado por un primer actuador que tiene un vastago movil al que esta fijada una cremallera lineal que coopera con unos pinones giratorios alrededor de un eje soportado en un punto fijo de la maquina, y dichos pinones mueve un miembro doblador que produce un doblado de hasta 180° de la solapa, y un dispositivo de tope accionado por un segundo actuador que mueve unos topes giratorios alrededor de respectivos ejes mutuamente paralelos entre una posicion de trabajo, en la que los topes se apoyan sobre la llnea de hendido o en las inmediaciones de la misma para prevenir que la solapa gire alrededor de un eje distinto al determinado por la llnea de hendido, y una posicion retirada, en la que los topes estan fuera de la trayectoria seguida por la solapa al girar alrededor de la llnea de hendido. En una secuencia de actuacion, primero actua el segundo actuador del dispositivo de tope para situar los topes en la posicion de trabajo, a continuation actua el primer actuador del dispositivo doblador para empezar a doblar la solapa, y cuando la solapa se ha doblado un determinado angulo, el segundo actuador actua de nuevo para retirar los topes a la posicion retirada permitiendo que el primer actuador acabe de doblar la solapa 180° sir interferir con los topes.Document ES 1032786 U discloses a double wall flap folding device where the folding is carried out in two steps and outside the area of the molding cavity. This device comprises a bending device actuated by a first actuator that has a mobile rod to which a linear rack is attached that cooperates with rotating pins around an axis supported at a fixed point of the machine, and said pins moves a bending member that it produces a bending of up to 180 ° of the flap, and a stop device actuated by a second actuator that moves rotating stops around respective mutually parallel axes between a working position, in which the stops rest on the creasing line or in the vicinity thereof to prevent the flap from rotating around an axis other than that determined by the creasing line, and a retired position, in which the stops are off the path followed by the flap when turning around the line of cleft. In an actuation sequence, the second actuator of the stopper device first acts to place the stops in the working position, then the first actuator of the folding device acts to begin folding the flap, and when the flap has bent a certain angle, the second actuator acts again to remove the stops to the removed position allowing the first actuator to just bend the flap 180 ° to interfere with the stops.

El dispositivo de doblado de solapas de pared doble descrito en el citado documento ES 1032786 A1 es complejo, voluminoso y economicamente costoso, y ademas proporciona un tiempo de plegado relativamente largo.The double wall flap bending device described in the aforementioned document ES 1032786 A1 is complex, bulky and economically expensive, and also provides a relatively long folding time.

El documento ES 2432097 A1 describe un dispositivo doblador especlficamente disenado para el doblado de solapas de pared doble aplicable a una maquina formadora de cajas.Document ES 2432097 A1 describes a specifically designed folding device for folding double wall flaps applicable to a box-forming machine.

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Este dispositivo doblador de solapas de pared doble comprende un miembro doblador accionado por mecanismo de manivela y biela acoplado a un actuador, preferentemente neumatico, que va unido a un punto fijo de la maquina. El dispositivo es apto para ser utilizado en la zona de la cavidad de moldeo de la maquina formadora de cajas. No obstante, el citado documento ES 2432097 A1 no describe un dispositivo de tope asociado al dispositivo doblador.This double wall flap folding device comprises a folding member actuated by a crank and connecting rod mechanism coupled to an actuator, preferably pneumatic, which is connected to a fixed point of the machine. The device is suitable for use in the area of the molding cavity of the box forming machine. However, said document ES 2432097 A1 does not describe a stopper device associated with the bender device.

Un objetivo de la presente invention es, por consiguiente, aportar un dispositivo de tope para el doblado de solapas en planchas de material laminar semirrlgido aplicable a una maquina formadora de cajas, que sea capaz de cooperar con un dispositivo doblador en la realization de un correcto doblado de las solapas de pared doble ante posibles defectos de hendido en las planchas de material laminar semirrlgido, que sea mas simple, compacto y economico que los dispositivos del estado del arte, y que proporcione un tiempo de plegado considerablemente mas corto que los dispositivos del estado del arte.An objective of the present invention is, therefore, to provide a stop device for the folding of flaps in sheets of semi-rigid sheet material applicable to a box-forming machine, which is capable of cooperating with a folding device in the realization of a correct bending the double wall flaps to possible creasing defects in the sheets of semi-rigid sheet material, which is simpler, more compact and economical than state-of-the-art devices, and that provides a considerably shorter folding time than the devices of the state of the art

Exposition de la invencionExposition of the invention

La presente invencion contribuye a alcanzar el anterior y otros objetivos aportando un dispositivo de tope que comprende al menos un elemento de tope, el cual tiene una porcion de anclaje unida a una estructura de una maquina formadora de cajas a partir de planchas de material laminar semirrlgido y un extremo de contacto distanciado de dicha portion de anclaje. El mencionado extremo de contacto es movible entre una position de trabajo, en la que el extremo de contacto ofrece un punto de resistencia sobre o cerca de una llnea de hendido formada entre una solapa y una aleta de pared en una plancha de material laminar semirrlgido, y una posicion retirada, en la que el extremo de contacto esta fuera de una trayectoria seguida por dicha solapa al girar alrededor de dicha llnea de hendido bajo la accion de un dispositivo doblador.The present invention contributes to achieving the previous and other objectives by providing a stopper device comprising at least one stopper element, which has an anchor portion attached to a structure of a box-forming machine from sheets of semi-rigid sheet material and a contact end spaced from said anchor portion. Said contact end is movable between a working position, in which the contact end offers a point of resistance on or near a creasing line formed between a flap and a wall fin on a sheet of semi-rigid sheet material, and a withdrawn position, in which the contact end is off a path followed by said flap as it rotates around said creasing line under the action of a bending device.

El dispositivo de tope de la presente invencion esta caracterizado por que la porcion de anclaje tiene una posicion fija respecto a dicha estructura y el extremo de contacto esta conectado a la porcion de anclaje por una porcion elastica que en ausencia de fuerzas externas aplicadas sobre dicho elemento de tope mantiene el extremo de contacto en dicha posicion de trabajo y efectua su retorno a la posicion de trabajo desde la posicion retirada. El elemento de tope incluyendo la porcion elastica es lo suficientemente resistente a la compresion para forzar el doblado de la solapa. No obstante, la mencionada porcion elastica ofrece una resistencia a la flexion que puede ser vencida por una fuerza ejercida por dicho dispositivo doblador al girar la solapa alrededor de dicha la llnea de hendido permitiendo elThe stop device of the present invention is characterized in that the anchor portion has a fixed position with respect to said structure and the contact end is connected to the anchor portion by an elastic portion that in the absence of external forces applied on said element stop keeps the contact end in said working position and returns to the working position from the removed position. The stop element including the elastic portion is sufficiently resistant to compression to force the folding of the flap. However, said elastic portion offers a flexural strength that can be overcome by a force exerted by said folding device by rotating the flap around said creasing line allowing the

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movimiento del extremo de contacto desde la posicion de trabajo hasta dicha posicion retirada.movement of the contact end from the working position to said removed position.

En resumen, el dispositivo de tope de la presente invention se basa meramente en la energla elastica almacenada en la portion elastica del elemento de tope para realizar su funcion de forzar el doblado de la plancha de material laminar semirrlgido por la llnea hendido deseada sin necesidad de usar mecanismos accionados por actuadores alimentados con energla neumatica o de otro tipo, con lo que el dispositivo de tope es simple, compacto y economico, y no anade ningun tiempo adicional al tiempo de plegado usado por el dispositivo doblador. En virtud de su diseno simple y compacto, el dispositivo de tope de la presente invencion puede ser instalado en cualquier punto de una maquina plegadora de cajas, incluyendo una bancada de la maquina, ya sea en la zona de una cavidad de moldeo, en una zona previa a la cavidad de moldeo, o en un macho que coopera con la cavidad de moldeo para conformar cajas a partir de las planchas de material laminar semirrlgido.In summary, the stop device of the present invention is based solely on the elastic energy stored in the elastic portion of the stop element to perform its function of forcing the folding of the sheet of semi-rigid sheet material by the desired split line without the need for use mechanisms operated by actuators fed with pneumatic or other energy, so that the stopper device is simple, compact and economical, and does not add any additional time to the folding time used by the bender device. By virtue of its simple and compact design, the stop device of the present invention can be installed at any point of a box folding machine, including a machine bed, either in the area of a molding cavity, in a area prior to the molding cavity, or in a male that cooperates with the molding cavity to form boxes from the sheets of semi-rigid sheet material.

En una primera realization, la porcion de anclaje del elemento de tope esta formada por una primera pieza y el extremo de contacto esta formado en una porcion distal que esta formada por una segunda pieza conectada a dicha primera pieza que forma la porcion de anclaje por la porcion elastica, de manera que la porcion elastica tiene un primer extremo conectado a la primera pieza que forma porcion de anclaje y un segundo extremo conectado a dicha segunda pieza que forma dicha porcion distal. Opcionalmente, la porcion elastica esta formada por un muelle helicoidal, y preferiblemente por un muelle helicoidal de traction pretensado. Opcionalmente, las primera y segunda piezas son rlgidas.In a first embodiment, the anchor portion of the stopper element is formed by a first piece and the contact end is formed in a distal portion that is formed by a second piece connected to said first piece that forms the anchor portion by the elastic portion, so that the elastic portion has a first end connected to the first piece forming an anchor portion and a second end connected to said second part forming said distal portion. Optionally, the elastic portion is formed by a helical spring, and preferably by a pre-tensioned traction helical spring. Optionally, the first and second pieces are rigid.

Como un posible ejemplo de conexion, la porcion de anclaje y la porcion distal del elemento de tope tienen unos respectivos extremos cillndricos con unos fileteados de rosca exterior que se acoplan a rosca dentro de dichos primer y segundo extremos del muelle helicoidal que forma la porcion elastica, respectivamente.As a possible connection example, the anchoring portion and the distal portion of the abutment element have respective cylindrical ends with threaded outer threads that are threadedly engaged within said first and second ends of the helical spring that forms the elastic portion respectively.

En una segunda realizacion, la porcion de anclaje, el extremo de contacto y la porcion elastica del elemento de tope estan formados como una sola pieza constituida por un fleje elastico, es decir, una banda relativamente ancha y delgada de un material elastico, tal como un acero para muelles o similar.In a second embodiment, the anchor portion, the contact end and the elastic portion of the stopper element are formed as a single piece consisting of an elastic strap, that is, a relatively wide and thin band of an elastic material, such as a spring steel or similar.

En una tercera realizacion, el elemento de tope esta formado de una manera analoga a la segunda realizacion por un fleje elastico que integra la porcion de anclaje, el extremo deIn a third embodiment, the stopper element is formed in a manner analogous to the second embodiment by an elastic strap that integrates the anchor portion, the end of

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contacto y la porcion elastica, y ademas, para amortiguar oscilaciones del fleje elastico, un elemento amortiguador esta dispuesto entre la estructura y el fleje elastico.contact and the elastic portion, and also, to dampen oscillations of the elastic strip, a damping element is disposed between the structure and the elastic strip.

En esta tercera realization, el mencionado elemento amortiguador esta constituido por un miembro elastico, tal como un muelle helicoidal, que tiene un primer extremo conectado a la estructura, el cual esta distanciado de la porcion de anclaje, por ejemplo por un vastago, y un segundo extremo conectado a un punto de la porcion elastica del fleje elastico entre la porcion de anclaje y el extremo de contacto. Preferiblemente, este segundo extremo del miembro elastico que constituye el elemento amortiguador esta fijado a un elemento corredero montado de manera que puede deslizar a lo largo de la porcion elastica del fleje elastico, y este elemento corredero puede ser fijado en una position seleccionada a lo largo de la porcion elastica del fleje elastico mediante un tornillo de fijacion.In this third embodiment, said damping element is constituted by an elastic member, such as a helical spring, which has a first end connected to the structure, which is distanced from the anchoring portion, for example by a rod, and a second end connected to a point of the elastic portion of the elastic strip between the anchor portion and the contact end. Preferably, this second end of the elastic member constituting the damping element is fixed to a sliding element mounted so that it can slide along the elastic portion of the elastic strap, and this sliding element can be fixed in a selected position along of the elastic portion of the elastic strap by means of a fixing screw.

El dispositivo de tope de la presente invention incluye unos medios de regulation que permiten regular la posicion del extremo de contacto del elemento de tope en relacion con la estructura de la maquina formadora de cajas donde esta fijado el dispositivo de tope. Para ello, dado que el elemento de tope es alargado segun una direction longitudinal, la porcion de anclaje esta unida a la estructura por medio de una brida provista de uno o mas tornillos de fijacion que permiten fijar la porcion de anclaje a dicha brida en una posicion seleccionada a lo largo de dicha direccion longitudinal.The stopper device of the present invention includes means of regulation that allow to regulate the position of the contact end of the stopper element in relation to the structure of the box-forming machine where the stopper device is fixed. To do this, since the stop element is elongated according to a longitudinal direction, the anchor portion is attached to the structure by means of a flange provided with one or more fixing screws that allow fixing the anchor portion to said flange in a selected position along said longitudinal direction.

Opcionalmente, el dispositivo de tope incluye un soporte unido a la estructura de la maquina formadora de cajas, y la brida esta conectada a dicho soporte mediante una abrazadera provista de al menos un tornillo de fijacion que permite fijar la brida al soporte en una posicion seleccionada a lo largo de una primera direccion transversal perpendicular a dicha direccion longitudinal.Optionally, the stopper device includes a support attached to the structure of the box-forming machine, and the flange is connected to said support by means of a clamp provided with at least one fixing screw that allows fixing the flange to the support in a selected position along a first transverse direction perpendicular to said longitudinal direction.

En otra variante, la brida esta conectada a una pieza intermedia, dicha pieza intermedia esta conectada a un soporte, y dicho soporte esta a su vez unido a la estructura de la maquina formadora de cajas. La pieza intermedia esta conectada al soporte mediante una abrazadera provista de al menos un tornillo de fijacion que permite fijar dicha pieza intermedia a dicho soporte en una posicion seleccionada a lo largo de una primera direccion transversal perpendicular a dicha direccion longitudinal, y la brida es deslizable a lo largo de la pieza intermedia en una segunda direccion transversal perpendicular tanto a la direccion longitudinal como a dicha primera direccion transversal, y estan provistos uno o mas tornillos de fijacion que permiten fijar la brida a la pieza intermedia en una posicion seleccionada a lo largo de dicha segunda direccion transversal.In another variant, the flange is connected to an intermediate piece, said intermediate piece is connected to a support, and said support is in turn attached to the structure of the box-forming machine. The intermediate piece is connected to the support by means of a clamp provided with at least one fixing screw that allows said intermediate piece to be fixed to said support in a selected position along a first transverse direction perpendicular to said longitudinal direction, and the flange is slidable along the intermediate piece in a second transverse direction perpendicular to both the longitudinal direction and said first transverse direction, and one or more fixing screws are provided which allow the flange to be fixed to the intermediate piece in a selected position along of said second transverse direction.

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En una realization, la pieza intermedia tiene una ranura de gula alargada en la segunda direction transversal y dichos uno o mas tornillos de fijacion usados para fijar la brida a la pieza intermedia son los mismos uno o mas tornillos de fijacion usados para fijar la portion de anclaje del elemento de tope a la brida. Estos uno o mas tornillos de fijacion comunes estan pasados a traves de dicha ranura de gula.In one embodiment, the intermediate piece has an elongated glutton groove in the second transverse direction and said one or more fixing screws used to fix the flange to the intermediate piece are the same one or more fixing screws used to fix the portion of anchoring of the stop element to the flange. These one or more common fixing screws are passed through said glide groove.

En virtud del diseno simple y compacto del dispositivo de tope de la presente invention, el dispositivo de tope puede ser instalado practicamente en cualquier position de cualquier estructura fija o movil de la maquina formadora de cajas. En un ejemplo de instalacion, la estructura de la maquina formadora de cajas donde esta unida la portion de anclaje del elemento de tope es una bancada fija de la maquina formadora de cajas, por ejemplo una region de la bancada previa a una cavidad de moldeo de la maquina formadora de cajas. En otro ejemplo de instalacion, la estructura de la maquina formadora de cajas donde esta unida la portion de anclaje del elemento de tope es un macho movil de la maquina formadora de cajas.By virtue of the simple and compact design of the stop device of the present invention, the stop device can be practically installed in any position of any fixed or mobile structure of the box-forming machine. In an installation example, the structure of the box-forming machine where the anchor portion of the stopper element is attached is a fixed bed of the box-forming machine, for example a region of the bench prior to a molding cavity of The box forming machine. In another installation example, the structure of the box-forming machine where the anchor portion of the stopper element is attached is a mobile male of the box-forming machine.

Breve description de los dibujosBrief description of the drawings

Las anteriores y otras caracterlsticas y ventajas de la presente invention se comprenderan mas plenamente a partir de la siguiente description detallada de unos ejemplos de realization con referencia a los dibujos que la acompanan, en los cuales:The foregoing and other features and advantages of the present invention will be more fully understood from the following detailed description of some examples of realization with reference to the accompanying drawings, in which:

la Fig. 1 es una vista en perspectiva de un dispositivo de tope para el doblado de solapas en planchas de material laminar semirrlgido segun una primera realization de la presente invention;Fig. 1 is a perspective view of a stop device for folding flaps in sheets of semi-rigid sheet material according to a first embodiment of the present invention;

la Fig. 2 es una vista parcial en perspectiva en explosion del dispositivo de tope de la primera realization;Fig. 2 is a partial exploded perspective view of the stopper device of the first embodiment;

la Fig. 3 es una vista en perspectiva de un dispositivo de tope para el doblado de solapas en planchas de material laminar semirrlgido segun una segunda realization de la presente invencion;Fig. 3 is a perspective view of a stop device for folding flaps in sheets of semi-rigid sheet material according to a second embodiment of the present invention;

la Fig. 4 es una vista en perspectiva de un dispositivo de tope para el doblado de solapas en planchas de material laminar semirrlgido segun una tercera realization de la presente invencion;Fig. 4 is a perspective view of a stop device for folding flaps in sheets of semi-rigid sheet material according to a third embodiment of the present invention;

la Fig. 5 es una vista en perspectiva de un dispositivo de tope segun una variante de la tercera realization.Fig. 5 is a perspective view of a stopper device according to a variant of the third embodiment.

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la Fig. 6 es una vista parcial en perspectiva del dispositivo de tope segun la primera realization instalado en una bancada de una maquina formadora de cajas y en una position de trabajo;Fig. 6 is a partial perspective view of the stopper device according to the first embodiment installed on a bed of a box-forming machine and in a working position;

la Fig. 7 es una vista parcial en perspectiva del dispositivo de tope de la Fig. 6 movido hacia una posicion retirada por la action de un dispositivo doblador de la maquina formadora de cajas; yFig. 7 is a partial perspective view of the stopper device of Fig. 6 moved towards a position removed by the action of a folding device of the box-forming machine; Y

la Fig. 8 es una vista lateral parcial del dispositivo de tope de la primera realizacion instalado en un macho movil de una maquina formadora de cajas y en una posicion de trabajo;Fig. 8 is a partial side view of the stopper device of the first embodiment installed in a mobile male of a box-forming machine and in a working position;

Description detallada de unos ejemplos de realizacionDetailed description of some examples of realization

Haciendo referencia en primer lugar a las Figs. 1 y 2, en ellas se muestra un dispositivo de tope para el doblado de solapas en planchas de material laminar semirrlgido de acuerdo con una primera realizacion de la presente invention. El dispositivo de tope de las Figs. 1 y 2 comprende un elemento de tope 1 que tiene una portion de anclaje 2 que en uso tiene una posicion fija respecto a una estructura 40, 45 de una maquina formadora de cajas (Figs. 6, 7 y 8), y un extremo de contacto 3 formado en una porcion distal 5 y distanciado de dicha porcion de anclaje 2.Referring first to Figs. 1 and 2, there is shown a stop device for the folding of flaps in sheets of semi-rigid sheet material according to a first embodiment of the present invention. The stop device of Figs. 1 and 2 comprises a stopper element 1 having an anchor portion 2 which in use has a fixed position with respect to a structure 40, 45 of a box-forming machine (Figs. 6, 7 and 8), and an end of contact 3 formed in a distal portion 5 and distanced from said anchor portion 2.

Tal como muestra mejor la Fig. 2, la porcion de anclaje 2 y la porcion distal 5 en la que esta formado el extremo de contacto 3 son unas primera y segunda piezas separadas, alargadas en una direction longitudinal X. Las primera y segunda piezas que forman la porcion de anclaje 2 y la porcion distal 5 estan conectadas la una a la otra por una porcion elastica 4 formada por un muelle helicoidal de traction pretensado que tiene un primer extremo 4a conectado a la porcion de anclaje 2 y un segundo extremo 4b conectado a la porcion distal 5. Para ello, la primera pieza que forma la porcion de anclaje 2 tiene un extremo cillndrico con un fileteado de rosca exterior 2a que se acopla a rosca en dicho primer extremo 4a del muelle helicoidal que forma la porcion elastica 4 y la segunda pieza que forma la porcion distal 5 tiene un extremo cillndrico con un fileteado de rosca exterior 5a que se acopla a rosca en dicho segundo extremo 4b del muelle helicoidal que forma la porcion elastica 4.As Fig. 2 best shows, the anchor portion 2 and the distal portion 5 in which the contact end 3 is formed are separate first and second pieces, elongated in a longitudinal direction X. The first and second pieces that they form the anchor portion 2 and the distal portion 5 are connected to each other by an elastic portion 4 formed by a pre-tensioned traction coil spring having a first end 4a connected to the anchor portion 2 and a second end 4b connected to the distal portion 5. For this, the first piece that forms the anchor portion 2 has a cylindrical end with an external thread thread 2a that is threadedly coupled to said first end 4a of the helical spring that forms the elastic portion 4 and the second piece that forms the distal portion 5 has a cylindrical end with an external thread thread 5a that is threadedly coupled to said second end 4b of the helical spring that forms the elastic portion 4.

En ausencia de fuerzas externas aplicadas sobre el elemento de tope 1, la porcion elastica 4 mantienen la porcion distal 5 alineada con la porcion de anclaje 2, y al recibir una fuerza externa aplicada sobre el elemento de tope 1 se deforma para permitir un movimiento de la porcion distal 5 y del extremo de contacto 3 en relation con la porcion de anclaje. Despues de que la porcion distal 5 haya sido movida, la porcion elastica 4 retorna automaticamente la porcion distal 5 a una posicion alineada con la porcion de anclaje 2 utilizando la energlaIn the absence of external forces applied on the stopper element 1, the elastic portion 4 keeps the distal portion 5 aligned with the anchoring portion 2, and upon receiving an external force applied on the stopper element 1 is deformed to allow a movement of the distal portion 5 and the contact end 3 in relation to the anchor portion. After the distal portion 5 has been moved, the elastic portion 4 automatically returns the distal portion 5 to a position aligned with the anchor portion 2 using the energy

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elastica almacenada en la misma sin necesidad de un actuador alimentado por otras fuentes de energla.Elastic stored in it without the need for an actuator powered by other energy sources.

El dispositivo de tope segun esta primera realization incluye un soporte 13 previsto para ser unido rlgidamente a la mencionada estructura 40, 45 de la maquina formadora de cajas mediante tornillos insertados en unos agujeros 24 formados en el soporte 13, y la portion de anclaje 2 del elemento de tope 1 esta conectada al soporte 13 por una brida 11 que tiene un canal 18 orientado en dicha direction longitudinal X a lo largo del cual puede deslizar la porcion de anclaje 2. Un tornillo de fijacion 12 que estrecha dicha brida 11 permite fijar la porcion de anclaje 2 a la brida 11 en una position seleccionada a lo largo de la direccion longitudinal X. A su vez, la brida 11 esta conectada al soporte 13 mediante una abrazadera 14 provista de un rebaje 20 (Fig. 2) orientado en una direccion transversal Y perpendicular a dicha direccion longitudinal X, de manera que el soporte 13 puede deslizar a lo largo de dicho rebaje 20. Unos tornillos de fijacion 15 que conectan la abrazadera 14 a la brida 11 permiten atrapar el soporte 13 entre la abrazadera 14 y la brida 11 y fijar la brida 11 a dicho soporte 13 en una posicion seleccionada a lo largo de dicha direccion transversal Y.The stopper device according to this first embodiment includes a support 13 provided to be rigidly attached to said structure 40, 45 of the box-forming machine by means of screws inserted in holes 24 formed in the support 13, and the anchor portion 2 of the stopper element 1 is connected to the support 13 by a flange 11 having a channel 18 oriented in said longitudinal direction X along which the anchoring portion 2 can slide. A fixing screw 12 that narrows said flange 11 allows to fix the anchoring portion 2 to the flange 11 in a selected position along the longitudinal direction X. In turn, the flange 11 is connected to the support 13 by a clamp 14 provided with a recess 20 (Fig. 2) oriented in a transverse direction Y perpendicular to said longitudinal direction X, so that the support 13 can slide along said recess 20. Fixing screws 15 connecting the clamp 14 to the flange a 11 allow the support 13 to be caught between the clamp 14 and the flange 11 and to fix the flange 11 to said support 13 in a selected position along said transverse direction Y.

Las Figs. 6, 7 y 8 muestran el funcionamiento del dispositivo de tope segun la primera realizacion de la presente invencion aplicado a diferentes estructuras de una maquina formadora de cajas a partir de planchas de material laminar semirrlgido.Figs. 6, 7 and 8 show the operation of the stopper device according to the first embodiment of the present invention applied to different structures of a box-forming machine from sheets of semi-rigid sheet material.

En las Figs. 6 y 7, la estructura de la maquina formadora de cajas a la que esta unida la porcion de anclaje 2 del elemento de tope 1 es una bancada 40 fija de la maquina formadora de cajas. Mas especlficamente, el elemento de tope 1 esta unido a una region de la mencionada bancada 40 donde las planchas de material laminar semirrlgido 50 son detenidas momentaneamente antes de ser colocadas sobre una cavidad de moldeo de la maquina formadora de cajas.In Figs. 6 and 7, the structure of the box-forming machine to which the anchoring portion 2 of the stopper element 1 is attached is a fixed bench 40 of the box-forming machine. More specifically, the stopper element 1 is connected to a region of said bench 40 where the sheets of semi-rigid sheet material 50 are stopped momentarily before being placed on a molding cavity of the box-forming machine.

En la Fig. 6, el elemento de tope 1 esta situado por encima de una plancha de material laminar semirrlgido 50 y en una posicion perpendicular a la misma. Dicha plancha de material laminar semirrlgido 50 esta previamente troquelada y tiene una aleta de pared 52 conectada a un panel de base 54 por una llnea de hendido 55 (no mostrados en las Figs. 6 y 7; vease la Fig. 8) y una solapa 51 conectada a dicha aleta de pared 52 por una llnea de hendido 53. En la posicion mostrada, la solapa 51 esta situada sobre una placa dobladora 31 de un dispositivo doblador 30 instalado en la bancada 40 de la maquina formadora de cajas. El dispositivo doblador 30 esta accionado por un actuador (no mostrado).In Fig. 6, the stopper element 1 is located above a sheet of semi-rigid sheet material 50 and in a position perpendicular thereto. Said sheet of semi-rigid sheet material 50 is previously stamped and has a wall fin 52 connected to a base panel 54 by a creasing line 55 (not shown in Figs. 6 and 7; see Fig. 8) and a flap 51 connected to said wall fin 52 by a creasing line 53. In the position shown, the flap 51 is located on a bending plate 31 of a bending device 30 installed in the bed 40 of the box-forming machine. The bender device 30 is actuated by an actuator (not shown).

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En ausencia de fuerzas externas aplicadas sobre el elemento de tope 1 (Fig. 6), el extremo de contacto 3 se mantiene una posicion de trabajo, en la que el extremo de contacto 3 ofrece un punto de resistencia sobre o cerca de dicha llnea de hendido 53 formada entre la solapa 51 y la aleta de pared 52 de la plancha de material laminar semirrlgido 50. Asl, cuando el dispositivo doblador 30 es accionado, la placa dobladora 31 gira alrededor de un eje (no mostrado) paralelo a la llnea de hendido 53 y el elemento de tope 1, el cual es significativamente resistente a la compresion en la direction longitudinal, fuerza el plegado de la solapa 51 alrededor de la llnea de hendido 53.In the absence of external forces applied on the stopper element 1 (Fig. 6), the contact end 3 is maintained a working position, in which the contact end 3 offers a point of resistance on or near said line of cleft 53 formed between the flap 51 and the wall fin 52 of the semi-rigid sheet 50. Thus, when the folding device 30 is actuated, the bending plate 31 rotates around an axis (not shown) parallel to the line of creasing 53 and the stopper element 1, which is significantly resistant to compression in the longitudinal direction, forces the folding of the flap 51 around the creasing line 53.

La portion elastica 4 del elemento de tope 1 ofrece una resistencia a la flexion que es vencida por la fuerza ejercida por dicho dispositivo doblador 30 al girar la solapa 51 alrededor de la la llnea de hendido 53, de manera que la placa dobladora 30 o la solapa 51 al girar empujan la porcion distal 5 del elemento de tope moviendo el extremo de contacto 3 desde la posicion de trabajo hasta una posicion retirada (Fig. 7), en la que el extremo de contacto 3 esta fuera de la trayectoria seguida por la solapa 51 al girar alrededor de la llnea de hendido 53 bajo la action del dispositivo doblador 30. Cuando el elemento de tope 1 escapa de la placa dobladora 30 o de la solapa 51, la porcion elastica 4 del elemento de tope 1 retorna automaticamente el extremo de contacto 3 a la posicion de trabajo para actuar sobre la siguiente plancha de material laminar semirrlgido 50.The elastic portion 4 of the stopper element 1 offers a flexural strength that is overcome by the force exerted by said bending device 30 by rotating the flap 51 around the creasing line 53, so that the bending plate 30 or the flap 51 when turning pushes the distal portion 5 of the stop element by moving the contact end 3 from the working position to a removed position (Fig. 7), in which the contact end 3 is out of the path followed by the flap 51 as it rotates around the creasing line 53 under the action of the bender device 30. When the stopper element 1 escapes from the bending plate 30 or the flap 51, the elastic portion 4 of the stopper element 1 automatically returns the end from contact 3 to the working position to act on the next sheet of semi-rigid sheet material 50.

En la Fig. 8, la estructura de la maquina formadora de cajas donde esta unida la porcion de anclaje 2 del elemento de tope 1 es un macho 45 movil de la maquina formadora de cajas. El mencionado macho 45 esta dotado de un movimiento de vaiven accionado por un actuador (no mostrado) y coopera con una cavidad de moldeo 41 provista en la bancada (no mostrada) de la maquina formadora de cajas. Un par de dispositivos dobladores 30 estan montados en unos soportes 35 fijados a la bancada en lados opuestos de la cavidad de moldeo 41. Cada uno de dichos dispositivos dobladores 30 analogo al descrito en el citado documento ES 2432097 A1, el cual tiene una placa dobladora 31 accionada por un actuador 32 por medio de un mecanismo que incluye un balancln 33 y una biela 34.In Fig. 8, the structure of the box-forming machine where the anchoring portion 2 of the stopper element 1 is attached is a mobile male 45 of the box-forming machine. Said male 45 is provided with a vaiven movement driven by an actuator (not shown) and cooperates with a molding cavity 41 provided in the bed (not shown) of the box-forming machine. A pair of bending devices 30 are mounted on supports 35 fixed to the bed on opposite sides of the molding cavity 41. Each of said bending devices 30 analogous to that described in said document ES 2432097 A1, which has a bending plate 31 operated by an actuator 32 by means of a mechanism that includes a rocker 33 and a connecting rod 34.

En la situation mostrada en la Fig. 8, el macho ha introducido la plancha de material laminar semirrlgido 50 al interior de la cavidad de moldeo 41 empujando el panel de base 54, lo que ha ocasionado el doblamiento de las aletas de pared 52 alrededor de sus correspondientes llneas de hendido 55 hasta una posicion perpendicular al panel de base 54, y los dispositivos dobladores 30 estan iniciando el doblado de las solapas 51 alrededor de sus correspondientes llneas de hendido 53 mientras los extremos de contacto 3 de los elementos de tope 1 estan en sus posiciones de trabajo ofreciendo unos puntos deIn the situation shown in Fig. 8, the male has introduced the sheet of semi-rigid sheet material 50 into the molding cavity 41 by pushing the base panel 54, which has caused the wall fins 52 to bend around their corresponding creasing lines 55 to a position perpendicular to the base panel 54, and the folding devices 30 are initiating the folding of the flaps 51 around their corresponding creasing lines 53 while the contact ends 3 of the stop elements 1 are in their work positions offering some points of

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resistencia sobre o cerca de las llneas de hendido 53. El movimiento de los extremos de contacto 3 a las posiciones retiradas y su retorno a la posicion de trabajo se produce una manera similar a la descrita mas arriba en relacion con las Figs. 6 y 7.resistance on or near the creasing lines 53. The movement of the contact ends 3 to the removed positions and their return to the working position occurs in a manner similar to that described above in relation to Figs. 6 and 7.

Se observara que los elementos de regulation y fijacion para fijar el elemento de tope a la estructura de la maquina formadora de cajas mostrados en las Figs. 6, 7 y 8 son una variante de los mostrados en las Figs. 1 y 2, y representan una de las numerosas variantes posibles alternativas.It will be noted that the regulation and fixing elements for fixing the stop element to the structure of the box-forming machine shown in Figs. 6, 7 and 8 are a variant of those shown in Figs. 1 and 2, and represent one of the numerous possible alternative variants.

La Fig. 3 muestra un dispositivo de tope segun una segunda realization de la presente invention, el cual comprende un fleje elastico 6 hecho de una sola pieza que constituye la portion de anclaje 2, el extremo de contacto 3 y la portion elastica 4 del elemento de tope 1. El mencionado fleje elastico 6 es alargado en una direction longitudinal X. El dispositivo de tope segun esta segunda realizacion incluye un soporte 13 previsto para ser unido rlgidamente a la mencionada estructura 40, 45 de la maquina formadora de cajas, una pieza intermedia 16 conectada a dicho soporte 13 mediante una abrazadera 14 y una brida 11 mediante la cual el elemento de tope 1 es conectado a dicha pieza intermedia 16.Fig. 3 shows a stopper device according to a second embodiment of the present invention, which comprises an elastic strap 6 made of a single piece constituting the anchor portion 2, the contact end 3 and the elastic portion 4 of the element of stop 1. The mentioned elastic strap 6 is elongated in a longitudinal direction X. The stop device according to this second embodiment includes a support 13 intended to be rigidly attached to said structure 40, 45 of the box-forming machine, a piece intermediate 16 connected to said support 13 by means of a clamp 14 and a flange 11 whereby the stop element 1 is connected to said intermediate piece 16.

La brida 11 tiene un rebaje 19 orientado en dicha direccion longitudinal X a lo largo del cual puede deslizar la porcion de anclaje 2 del elemento de tope 1, y unos tornillos de fijacion 12 que aplican la brida 11 contra la pieza intermedia 16 permiten atrapar la porcion de anclaje 2 entre la brida 11 y la pieza intermedia 16 y fijar la porcion de anclaje 2 a la brida 11 en una posicion seleccionada a lo largo de la direccion longitudinal X. La mencionada abrazadera 14 esta provista de un rebaje orientado en una primera direccion transversal Y perpendicular a la direccion longitudinal X a lo largo del cual puede deslizar el soporte 13, y unos tornillos de fijacion 15 que conectan la abrazadera 14 a la pieza intermedia 16 permiten atrapar el soporte 13 entre la abrazadera 14 y pieza intermedia 16 y fijar la pieza intermedia 16 al soporte 13 en una posicion seleccionada a lo largo de dicha primera direccion transversal Y.The flange 11 has a recess 19 oriented in said longitudinal direction X along which the anchoring portion 2 of the stopper element 1 can slide, and fixing screws 12 that apply the flange 11 against the intermediate piece 16 allow to catch the anchoring portion 2 between the flange 11 and the intermediate piece 16 and fixing the anchoring portion 2 to the flange 11 in a selected position along the longitudinal direction X. The mentioned clamp 14 is provided with a recess oriented in a first transverse direction Y perpendicular to the longitudinal direction X along which the support 13 can slide, and fixing screws 15 connecting the clamp 14 to the intermediate piece 16 allow the support 13 to be trapped between the clamp 14 and intermediate piece 16 and fixing the intermediate piece 16 to the support 13 in a selected position along said first transverse direction Y.

La pieza intermedia 16 tiene ademas una ranura de gula 17 alargada en una segunda direccion transversal Z perpendicular a la direccion longitudinal X y perpendicular a la primera direccion transversal Y. Los mismos tornillos de fijacion 12 que fijan la porcion de anclaje 2 del elemento de tope 1 a la brida 11 estan pasados a traves de dicha ranura de gula 17 de manera que la brida 11 y los tornillos de fijacion 12 pueden deslizar a lo largo de la ranura de gula 17, y los tornillos de fijacion 12 permiten fijar la brida 11 en una posicion seleccionada a lo largo de dicha segunda direccion transversal Z al mismo tiempo que fijan el elemento de tope 1.The intermediate piece 16 also has an elongated groove 17 in a second transverse direction Z perpendicular to the longitudinal direction X and perpendicular to the first transverse direction Y. The same fixing screws 12 that fix the anchoring portion 2 of the stopper element 1 to the flange 11 are passed through said glutton groove 17 so that the flange 11 and the fastening screws 12 can slide along the glutton groove 17, and the fastening screws 12 allow fixing the flange 11 in a selected position along said second transverse direction Z at the same time as they fix the stopper element 1.

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Un experto en la tecnica comprendera que los elementos de regulation y fijacion descritos en relation con las primera y segunda realizaciones son intercambiables y/o combinables entre si sin salirse del alcance de la presente invention.One skilled in the art will understand that the regulation and fixing elements described in relation to the first and second embodiments are interchangeable and / or combinable with each other without departing from the scope of the present invention.

La Fig. 4 muestra una tercera realization de la presente invention, donde el elemento de tope 1 esta constituido por un fleje elastico 6 analogo al descrito mas arriba en relation con la Fig. 3 y donde el dispositivo de tope incluye unos elementos de regulation y fijacion para regular y fijar la position de dicho fleje elastico 6 respecto a la estructura 40, 45 de la maquina formadora de cajas que son tambien analogos a los descritos mas arriba en relation con la Fig. 3. No obstante, en esta tercera realization, entre la estructura 40, 45 y el fleje elastico 6, o mas especlficamente entre uno de dichos elementos de regulation y fijacion fijados a la estructura 40, 45 y el fleje elastico 6 esta dispuesto un elemento amortiguador 7 para amortiguar oscilaciones del fleje elastico 6.Fig. 4 shows a third embodiment of the present invention, where the stop element 1 is constituted by an elastic strip 6 analogous to that described above in relation to Fig. 3 and where the stop device includes regulation elements and fixing to regulate and fix the position of said elastic strap 6 with respect to the structure 40, 45 of the box-forming machine that are also analogous to those described above in relation to Fig. 3. However, in this third embodiment, between the structure 40, 45 and the elastic strap 6, or more specifically between one of said regulation and fixing elements fixed to the structure 40, 45 and the elastic strap 6, a damping element 7 is provided to dampen oscillations of the elastic strap 6.

El mencionado elemento amortiguador 7 esta constituido por un miembro elastico, tal como un muelle helicoidal, que tiene un primer extremo 7a conectado a un vastago 10 fijado a su vez a la brida 11 y un segundo extremo 7b conectado a un punto de la portion elastica 4 del fleje elastico 6 entre la portion de anclaje 2 y el extremo de contacto 3. El mencionado vastago 10 mantiene el primer extremo 7a del miembro elastico que constituye el elemento amortiguador 7 distanciado de la portion de anclaje 2. El segundo extremo 7b del miembro elastico que constituye el elemento amortiguador 7 esta fijado a un elemento corredero 8 que tiene dos paredes paralelas 8a, 8b entre las cuales esta dispuesta la portion elastica 4 del fleje elastico 6 de manera que dicho elemento corredero 8 es deslizable a lo largo de la portion elastica 4 del fleje elastico 6.Said damping element 7 is constituted by an elastic member, such as a helical spring, which has a first end 7a connected to a rod 10 fixed in turn to the flange 11 and a second end 7b connected to a point of the elastic portion 4 of the elastic strip 6 between the anchor portion 2 and the contact end 3. The said rod 10 keeps the first end 7a of the elastic member constituting the damping element 7 spaced apart from the anchor portion 2. The second end 7b of the member The elastic constituting the damping element 7 is fixed to a sliding element 8 which has two parallel walls 8a, 8b between which the elastic portion 4 of the elastic strap 6 is arranged so that said sliding element 8 is slidable along the portion elastic 4 of the elastic strap 6.

El elemento corredero 8 tiene un tornillo de fijacion 9 mediante el cual dichas dos paredes paralelas 8a, 8b son aproximadas la una a la otra aprisionando al fleje elastico 6, con lo que el elemento corredero 8 es fijado en una position seleccionada a lo largo de la portion elastica 4 del fleje elastico 6. El segundo extremo 7b del miembro elastico que constituye el elemento amortiguador 7 esta fijado a dicho tornillo de fijacion 9, aunque alternativamente podrla estar fijado a cualquier otro elemento de enganche unido al elemento corredero 8 o formado en el mismo. Regulando la position del elemento corredero 8 respecto a la portion de anclaje 2 se puede regular el grado de amortiguacion proporcionado por el elemento amortiguador 7.The sliding element 8 has a fixing screw 9 by means of which said two parallel walls 8a, 8b are approximated to each other imprisoning the elastic strip 6, whereby the sliding element 8 is fixed in a selected position along the elastic portion 4 of the elastic strap 6. The second end 7b of the elastic member constituting the damping element 7 is fixed to said fixing screw 9, although alternatively it could be fixed to any other coupling element attached to the sliding element 8 or formed in the same. By regulating the position of the sliding element 8 with respect to the anchor portion 2, the degree of damping provided by the damping element 7 can be regulated.

La Fig. 5 muestra una variante de la tercera realization, la cual es en todo analoga a la descrita mas arriba en relation con la Fig. 4 excepto en la configuration y montaje delFig. 5 shows a variant of the third embodiment, which is analogous to the one described above in relation to Fig. 4 except in the configuration and assembly of the

elemento corredero 8. En la variante mostrada en la Fig. 5, el fleje elastico 6 tiene formada una ranura 21 a lo largo de la misma, y el tornillo de fijacion 9 esta pasado a traves de dicha ranura 21. Unas tuercas 22, 23 estan acopladas al tornillo de fijacion 9 en lados opuestos del fleje elastico 6, de manera que en esta variante el elemento corredero 8 esta constituido 5 por el tornillo de fijacion 9 y las mencionadas tuercas 22, 23. El segundo extremo 7b del miembro elastico que constituye el elemento amortiguador 7 esta enganchado al tornillo de fijacion 9. Aflojando las tuercas 22, 23 el elemento corredero 8 puede deslizar a lo largo de la ranura 21 y apretando las tuercas el elemento corredero 8 es fijado en una posicion seleccionada a lo largo de la ranura 21.sliding element 8. In the variant shown in Fig. 5, the elastic strip 6 has a groove 21 formed therein, and the fixing screw 9 is passed through said groove 21. Nuts 22, 23 they are coupled to the fixing screw 9 on opposite sides of the elastic strap 6, so that in this variant the sliding element 8 is constituted 5 by the fixing screw 9 and said nuts 22, 23. The second end 7b of the elastic member which constitutes the damping element 7 is attached to the fixing screw 9. By loosening the nuts 22, 23 the sliding element 8 can slide along the groove 21 and by tightening the nuts the sliding element 8 is fixed in a selected position along slot 21.

10 Hay que senalar un dispositivo de tope segun cualquiera de las segunda y tercera realizaciones, incluyendo sus variantes, podrla ser instalado en la bancada 40 o en el macho 45 de la maquina formadora de cajas de una manera similar a la descrita en relacion con las Figs. 6, 7 y 8 en sustitucion del dispositivo de tope de la primera realizacion.10 A stopper device must be indicated according to any of the second and third embodiments, including its variants, it could be installed in the bed 40 or in the male 45 of the box-forming machine in a manner similar to that described in relation to the Figs. 6, 7 and 8 replacing the stopper device of the first embodiment.

El alcance de la presente invencion esta definido en las reivindicaciones adjuntas.The scope of the present invention is defined in the appended claims.

Claims

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1. - Stop device for the folding of flaps in sheets of semi-rigid sheet material, comprising at least one stop element (1) having an anchor portion (2) attached to a structure (40, 45) of a forming machine of boxes from sheets of semi-rigid sheet material and a contact end (3) distanced from said anchoring portion (2), said contact end (3) being movable between a working position, in which the contact end (3) offers a point of resistance on or near a creasing line (53) formed between a flap (51) and a wall fin (52) on a sheet of semi-rigid sheet material (50), and a withdrawn position, wherein the contact end (3) is off a path followed by said flap (51) when rotating around said creasing line (53) under the action of a bending device (30), characterized in that the portion of anchor (2) has a fixed position with respect to said structure (40, 45) and the contact end (3) is connected to the anchoring portion (2) by an elastic portion (4) that in the absence of external forces applied on said stopper element (1) maintains the contact end (3) in said position working and makes its return to it, where said elastic portion (4) offers a resistance to bending that can be overcome by a force exerted by said bending device (30) by rotating the flap (51) around said line of creasing (53) allowing the movement of the contact end (3) from the working position to said removed position.

2. - Stopper device according to claim 1, characterized in that the anchoring portion (2) is formed by a first piece and the contact end (3) is formed in a distal portion (5) which is a second piece, wherein the elastic portion (4) has a first end (4a) connected to said first piece that forms the anchor portion (2) and a second end (4b) connected to said second piece that forms said distal portion (5).

3. - Stopper device according to claim 2, characterized in that the elastic portion (4) is formed by a helical spring.

4. - Stopper device according to claim 3, characterized in that said helical spring forming the elastic portion (4) is a prestressed traction coil spring.

5. - Stopper device according to claim 3 or 4, characterized in that the first piece forming an anchoring portion (2) has a cylindrical end with an external thread thread (2a) that is threadedly coupled to said first end ( 4a) of said helical spring forming the elastic portion (4) and the second piece forming the distal portion (5) has a

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cylindrical end with an external thread thread (5a) that is screwed into said second end (4b) of the helical spring that forms the elastic portion (4).

6. - Stopper device according to claim 1, characterized in that the anchoring portion (2), the contact end (3) and the elastic portion (4) are formed in a single piece consisting of an elastic strap (6) .

7. - Stopper device according to claim 6, characterized in that a damping element (7) is arranged between the structure (40, 45) and said elastic strap (6) to dampen oscillations of the elastic strap (6).

8. - Stopper device according to claim 7, characterized in that said damping element (7) is constituted by an elastic member having a first end (7a) connected to the structure (40, 45) and a second end (7b) connected to a point of the elastic portion (4) of the elastic strip (6) between the anchor portion (2) and the contact end (3).

9. - Stopper device according to claim 8, characterized in that said first end (7a) of said elastic member constituting the damping element (7) is connected to a fixed point with respect to the structure (40, 45) distanced from the anchor portion (2) by a rod (10).

10. - Stopper device according to claim 8 or 9, characterized in that said second end (7b) of the elastic member constituting the damping element (7) is fixed to a sliding element (8) slidable along the elastic portion (4) of the elastic strap (6), and said sliding element (8) is fixed in a selected position along the elastic portion (4) of the elastic strap (6) by means of a fixing screw (9).

11. - Stop device according to claim 8, 9 or 10, characterized in that said elastic member constituting the damping element (7) is a helical spring.

12. - Stopper device according to any one of the preceding claims, characterized in that the stopper element (1) is elongated according to a longitudinal direction (X), and the anchoring portion (2) is attached to a point with respect to the structure (40, 45) by a flange (11) provided with at least one fixing screw (12) that allows fixing the anchoring portion (2) to said flange (11) in a selected position along said longitudinal direction (X)

5

10

fifteen

twenty

25

30

13. - Stop device according to revindication 12, characterized in that the flange (11) is connected to a support (13) by means of a clamp (14) provided with at least one fixing screw (15) that allows fixing the flange ( 11) to said support (13) in a selected position along a first transverse direction (Y) perpendicular to said longitudinal direction (X), where the support (13) is attached to the structure (40, 45).

14. - Stopper device according to claim 12, characterized in that the flange (11) is connected to an intermediate piece (16), and said intermediate piece (16) is in turn connected to a support (13) by means of a clamp (14) provided with at least one fixing screw (15) which allows said intermediate piece (16) to be fixed to said support (13) in a selected position along a first transverse direction (Y) perpendicular to said longitudinal direction ( X), where the support (13) is attached to the structure (40, 45).

15. - Stopper device according to claim 14, characterized in that the flange (11) is slidable along the intermediate piece (16) in a second transverse direction (Z) perpendicular to said longitudinal direction (X), and the less a fixing screw allows fixing the flange (11) to the intermediate piece (16) in a selected position along said second transverse direction (Z).

16. - Stopper device according to claim 14, characterized in that the intermediate piece (16) has an elongated groove (17) in the second transverse direction (Z) and said at least one fixing screw that fixes the flange ( 11) to the intermediate piece (16) is said at least one fixing screw (12) of the flange (11), which is passed through said glide groove (17).

17. - Stop device according to any one of the preceding claims, characterized in that the structure (40, 45) of said box-forming machine to which the anchor portion (2) of the stop element (1) is attached is a bench (40) of the box forming machine.

18. - Stopper device according to claim 17, characterized in that the anchoring portion (2) of the stopper element (1) is attached to a point of said bed (40) prior to a molding cavity of the forming machine of boxes

19. - Stopper device according to any one of claims 1 to 16, characterized in that the structure (40, 45) of said box-forming machine where the anchoring portion (2) of the stopper element (1) is attached is a male (45) mobile of the box forming machine.